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If x years is the age of the younger, then 2x years is the age of the older.
x + 2x = 75
3x = 75
x = 75/3 = 25  is the age of the younger;  25*2 = 50  is the age of the older.
ANSWER.  Abdul is 25 years old;  Ahmed is 50 years old.
Solved.